Can someone help an idiot replace itune from ipod?

My I mac hard drive crashed. I know you're all heart broken. Anyway I have all my music on an Ipod, but have no idea how to put onto my new computers Itunes. It's a Mac G5. Can someone please help me? I am a total computer moron. I would need this information layed out in the most layman terms possible. I an teriffied of losing all my music and having to start over.
Also twice now my ipod has lost all the play lists and music. I have turned it off and rechecked it every few days. Than both times it has magiclly reappeared. Has this happened to anyone else? Does anyone know why this would happen? Please keep tech. terms to a minamum. Thanks.

then open up the disk image on the G5 (double click on the file)
then double click on the senuti icon to load the application, or first drag it over the applications folder alias (at the bottom) and load it from there

once the application has loaded click on the senuti menu and click on preferences, then click on copying in the preferences window, then click add to itunes, then close the preferences window

then select and drag the playlists one by one over the iTunes icon in the menu on the left hand side. It will then copy the playlists and play counts back to iTunes.

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